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It's probably worth grabbing just the part of my patch that
added the _PyLong_AsClippedSsize_t internal interface to
longobject.h - this used an output variable to indicate
whether or not clipping occurred, making it easy for
abstract.c to decide how to proceed.

No doubt some modifications would be needed to fit in with
Travis's patch, though, and I won't have time to do that
this week.